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This ID will be used to make sure that we don't mistakenly associate
the consent with an incorrect account if the user gives consent for an
account before finishing sign-in, or if the user signs out and signs in
to a different account before the proto can be transmitted.

Currently, the account ID is only an empty string. The field will be
populated once
https://chromium-review.googlesource.com/c/chromium/src/+/986293
lands. However, this CL can unblock the corresponding changes in
UserEventService that will consume this field.

Bug: 781765
Change-Id: I2dae998c599c2480771e54315627ee2be3bafe5d
Reviewed-on: https://chromium-review.googlesource.com/998195
Commit-Queue: Martin Šrámek <msramek@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548862}